West Branch Susquehanna River at Lewisburg, Northumberland County PA (LWBP1)
Gage Location: Northumberland County, Pennsylvania Site Location: Union County, Pennsylvania
Latitude: 40.968Longitude: -76.876Elevation: 428.2 ft. MSLDrainage Area: 6847 Sq. Mi.
Minor Stage: 18 ft. Moderate Stage: 23 ft.Major Stage: 28 ft.
First Flood: 1865-03-17Last Flood: 2011-09-08 Crest: 25.75 ft.Datum change: 1940-07-02Number of Floods: 39

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1865-03-1726.5-9999ModerateC1
1889-06-0129.8-9999MajorC1
1894-05-2128.5-9999MajorC1
1902-03-0122.3-9999MinorC1
1909-05-0119.5-9999MinorC1
1936-03-1932.1287000MajorC1 F1
1940-04-0122.7164000MinorC1
1942-05-2318.57117000Minornone
1942-12-3122.47151000Minornone
1946-05-2928.43262000Majornone
1948-04-1520.07132000Minornone
1950-03-3018.15107000Minornone
1950-11-2626.05216000Moderatenone
1952-03-1218.08112000Minornone
1954-03-0318.51118000Minornone
1956-03-0919.8121000Minornone
1956-11-0318.6118000Minornone
1959-01-2318.22115000Minornone
1960-04-0121134000Minornone
1961-02-2721.17139000Minornone
1964-03-1126.16210000ModerateC5
1972-06-2434.23300000MajorC5 F2
1975-09-2727.62242000ModerateF2
1979-03-0623.44165000ModerateC5 F2
1981-02-2418.83123000MinorC5 F2
1982-02-0319.82-9999MinorC5 F2
1984-02-1524.26192000ModerateC5 F2
1986-03-1518.61112000MinorC5 F2
1993-04-0221.33146000MinorF2
1994-03-2618.28111000MinorF2
1996-01-2025.94205000ModerateF2
1998-01-0918.83118000MinorF2
2004-09-1926.01209000ModerateC5 F2
2005-04-0318.79113000MinorF2
2010-01-2619.03118000MinorF2
2010-12-0220.9142000MinorF2
2011-03-1120.78122000MinorF2
2011-04-2920.1113000MinorF2
2011-09-0825.75168000ModerateF2



Codes and description

C1|Crest information looks unreliable and incomplete and not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 07:20 AM Nov 12, 2013